Size regulator



March 1942- n. GURNEY Er AL 2,275,141

S I 213 REGULATOR Filed Dec. 30, 1939 3 Sheets-Sheet l Z'mventor DANIEL GuzuEY March 3, 1942. GURNEY ETA]? 2,275,141

' SIZE REGULATOR Filed Dec. 30, 1959 1 5 Sheets-Sheet 2 DANIEL Gunuzv 3g Mmauzu A. HOLLENGREEN March 3, 1942. D. GURNEY EIAL S I ZE REGULATOR I5 Sheets-Sheet 3 Filed Dec 30, 1939 Eliminator v m u G L m M a Patented Mar. 3, 1942 SIZE REGULATOR Daniel Gurney, Jamestown, N. Y., and Milburn A.

Hollengreen, Waynesboro,

Pa., assignors to Landis Tool Company, Waynesboro, Pa, a corporation of Pennsylvania Application December 30, 1939, Serial No. 311,750

2 Claims.

Our invention relates to size regulators for grinding machines, particularly for machines grinding small internal work such as ball races 7 where the internal diameter is not great enough to permit the entrance of a sizing device reeler as well as the grinding wheel.

It is an object of our invention to provide means for controlling a grinding operation from a finished work piece.

A further object is to provide means to compensate for variation in work size and in wheel wear.

A further object is to provide means for effecting said compensation after each grinding operation.

In the drawings, Figure 1 is a plan view of our device. I v

Figure 2 is a right hand end elevation partly in section. V

Figure 3 is an end elevation of a wheel support and feed mechanism.

Figure 4 is a partial plan view of a grinding wheel and work piece in operative position.

Numeral l indicates a base member upon which is mounted a slide member H. Said base member is supported on a machine bed 33. A threaded shaft i2 is rotatably supported in end portions of said base member. A handwheel l3 having a calibrated surface M is keyed to one end of said shaft by a key 15. A pointer 16 attached to said base member extends to a position in operative relation to said calibrated surface. A nut ii on the threaded portion 88 of shaft 12 is secured to slide ii so that rotation of said shaft efiects movement of said slide. An upright memher 9 at oueend of said base member supports a pivoted member iii. A nozzle 2.3 having connection to a suitable supply oi fluid under pressure is mounted for vertical adjustment in a slot 34 in said pivoted member.

On slide ii is mounted a second slide 25. A spring 22 has one end attached to slide ii and the other end to pivoted member til, thus urging said member to the left. Movement of said pivoted member to the left is limited by a hardened button 23 thereon engaging a hardened pin 24 in the slide 25. Thus spring 22 also urges slide 25 to the left. Movement of said slide is limited by an adjustable stop 26. A plate 21 having a longitudinal slot 28 therein is secured to slide 25. On said slide are mounted two angularly spaced feeler members 29 and 30. Secured to slide it and extending thru slot 28 is a third feeler member 3|. Said feeler 3! is movable with slide 25 so that a work piece 32 may be placed thereon. With a work piece so positioned, feeler'3l determines the limit or movement of slide 25.

A grinding wheel 43 is mounted on a spindle in which is movable axially in a support ll on a wheel base 42 This structure is shown in detail in co-pending application Serial No. 214,358 filed June 17, 1938. Said spindle is driven by a belt 45 thru-a pulley 4G by motor 44. A pulley guard 41 has a shaft member 48 formed thereon in axial alignment with pulley 46. Mechanism described in detail in the above mentioned co-pending application, is attached to said shaft for efiecting axial movement thereof and also of the wheel spindle. Attached to said shaft also is a curved arm 50 having a button 5| therein, which, when the grind- I ing wheel is in contact with .a work piece, is

. positioned in the path of nozzle 2|. The function and operation of the air nozzle is similar to that described in Balsiger Patent 2,001,447 granted May 14, 1935. The means for feeding the grinding wheel 43 toward and from the work consists of an oscillating hydraulic motor which is connected by a crankarm 6| and connecting rod 62 to a feed screw 63 rotatably mounted in the bed of the machine. This is identical with the feed mechanism disclosed in the above mentioned application 214,358. The means for holding and rotating the work piece HI consists .01 a chuck H rotatably mounted on a headstock spindle (not shown). This structure is also shown and described in greater detail in the co-pending application 214,358.

Operation In setting our device for grinding a number of identical work pieces, one piece is first ground exactly to size and is then placed on the caliper formed by the plate 2? and the feelers 25, 30, and 3!. The feeler Eli thus positioned, also positions the slide 25 and to the pivoted member so. The nozzle 2! on said pivoted member is also positioned relative to the button 5 i.

The vertical position of said nozzle must also be determined. Theoretically, it would be half way between the pivot point and the point of con-. tact between button 23 and pin 26. However, this is not always true and the exact position for a given combination of work piece and grinding wheel must be determined experimentally. The operator then estimates the wheel wear for the particular wheelused, and by means of handwheel l3 adjusts the slide ii and all the parts carried thereby including the upright i9 and nozzle 2!. An unground piece of work is then placed in the machine and the grinding operation started.

As thegrinding proceeds, the arm 50 and button 5|, which are carried by the wheel support 42, approach nozzle 2|, and at a predetermined point the pressure of the air to the nozzle is such as to actuate a mercury column to close one or a series of electrical contacts and bring the grinding operation to an end, as described in the above mentioned application 214,358 and Patent 2,001,447. The finished work piece is placed on the caliper, thus resetting the slide 25 and hence the nozzle 2| byan amount equal to the diflerence between the size of the piece just ground and the size of the preceding piece. The operator then turns handwheel l3 to eflect a further adjustment of the entire slide including nozzle 2! by an amount corresponding to what he thinks the grinding ing a pair of cooperating elements movable relatively toward and from one another, a pivoted support for one of said elements, means for adjusting said support an amount corresponding to variation in size of a work piece, and means for adjusting the radial position of said size control element on said pivoted support whereby to modify said first mentioned adjustment.

\ 2. In a grinding machine, a wheel support, a grinding wheel rotatably mounted thereon, a work support, means for efiecting a relativefeeding movement between said supports, a size control mechanism, including a pair of cooperating elements one of which is movable toward the other in response to said relative movement between work and wheel during a grinding operation for controlling same, a pivoted support for one oi. said elements, a calipering device having means for engaging the ground surface of a finished work piece, means actuated by said work engaging member for determining the position of said pivoted support, and means for adjusting the position of said size control element on said pivoted support.

DANIEL GURNEY. MILBURN A. HOLLENGREEN. 

